consecutive numbering of elements in a matrix

Thank you and apologies--I did not make it clear that there are no NAs
mixed in with the valid values.  Rather, they all occur consecutively,
either toward the beginning of end of the column.
Jim

I didn't know what you wanted to do if there were NA's
in the middle of a column.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com  

Any ideas?
Thanks


Jim Bouldin, PhD
Research Ecologist
Department of Plant Sciences, UC Davis
Davis CA, 95616
530-554-1740

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Jim Bouldin, PhD
Research Ecologist
Department of Plant Sciences, UC Davis
Davis CA, 95616
530-554-1740